I agree about the exorbitant cost of the exchange tanks pricing....
But you are paying for the convenience. Since the OP has no transportation,
possibly being able to walk to a local curb market might make it worth the while.

So I Googled it, and found an online service that delivers a full tank of propane for $35 and I thought it was a good deal; anyone ?

Check to see if that is the price with exchanging/ them taking your empty tank...
All things considered $35 delivered to your door is not that bad...A little pricey maybe, but a Taxi to and fro, etc, etc. adds up.

__________________There is only one Quality worse than Hardness of Heart, and that is Softness of Head.

We live in apartment, in a building. We don't have a natural gas line that we can run out to the porch; I have a coworker who has that and it's very nice ! We all have electric dryers as we aren't zoned for gas, either.

I asked around, one friend said she went already, another couple said it was too far for them to drive.

We're actually pretty happy with this exchange service; for the fee they come at a specific time. I know it cost more than doing it myself, but I do think I save on the transportation, at least.

Thanks all, for your input !

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__________________IF ONLY 1/3 OF YOUR CLOTHES ARE A MISTAKE, YOU’RE AHEAD OF THE GAME. NORA EPHRON